Telescopic smoke-stack.



K. LANGER.

TELESCOPIC SMOKE STACK.

APPLICATION man Nov.2. 1911.

Patented Nov. 5, 1918.

2 SHEETS-SHEET 7 dit() KONRAD LANGrER, OF BALTIMORE, MARYLAND.

TELESCOPIC SMOKE-STACK.

Speeeation of Letters Patent.

rateatea nov. a, rais.

Application filed November 26, 1917. Serial No. 204,007.

To all whom t may concern:

Be it known that ll, KONRAD LANGER, a citizen of the United States, and a resident of Baltimore. in the State of Maryland, have invented a new and useful Improvenient in Telescopic Smoke-Stacks, of which the following is a specification.

My invention relates to an improvement in telescopic smoke stacks, and it consists in the constructions, combinations, and arrangements herein described and claimed.

An object of my invention is to provide a telescopic smoke stack adapted primarily for use on ocean going vessels, which in cludes jackscrew and gear devices for raising the extensible section, said devices being located externally ofthe stack so as to be protected from thestack gases, but also so located as to be protected from the weather.

Another object of the invention is to provide a stack as described, including a housing for the jackscrew and gear devices, to shield said devices both from the stack gases and the weather.

Another object of the invention is to provide equi-distantly located jackscrcw and gear-devices, for applying the lifting power to the extensible stack member, uniformly.

Another object of the invention is to provide an indicator whereby the height to which the extensible stack member has been raised, may be ascertained.

Other objects and advantages will appear in the following specication, reference being had to the accompanying drawings, in which:

Figure 1 is a vertical section of the preferred form of the telescopic stack showing the extensible member elevated.

Fig. 2 is a similar view showing the extensible member telescoped.

Fig. 8 is a cross section onthe line 3--3 of Fig. 2. i

Fig. i is avertical section of a slightly modified form of the stack.

Fig. 5 is a cross section on the line 5--5 of Fig. 1, and

Fig. 6 is a detail view of the indicator:

1n carrying out my inventlon, 1 provlde a stationary stack section 1 over which an extensible or telescopic stack section 2 slides. The stationary stack section 1 is inclosed in a stationary tube?) which is spaced therefrom `to leave an air space 4:. The exten sible stack section 2 carries a tube 5 which is telescopic in the stationary tube 3. llhe various tubes and stack sections are held in spaced relationship byany suitable means, expansion joint 6 being provided between the stack section 2 and the tube 5 at the top.

rllhe lower end of the stationary stack section 1 sets upon the outlet from the furnaces and is held in place in any suitable manner. The manner of mounting the stack is, however, of secondary importance in the present instance, and so the illustration has been omitted. 'lhe staclr projects through an opening 7 in the deck 8 of the vessel. The opening 7 is surrounded by a casing or flange 9. The stationary tube 3 carries an umbrella 10 which is riveted to the stationary tube. The umbrella 10 has a sloping top which terminates in an annular vertical flange extending below the plane of the top edge of the casing or Harige 9. llhe purpose of the umbrella. 10 is to deect moisture in the shape of rain or snow, and other foreign elements so that they may, not enter the opening 7 i The extensible stack section 2 carries a hood 11 at the top, which extends over and covers the entrance to the space 12 between the stack section 2 and the tube 5. The rim of the tube 5 is reinforced by an annular angle iron 13, to which eye-bolts and shackles 14 are attached. Guy wires are secured in the shackles. The function of the guy wires is, to brace the stack against wind pressure when it is in the extended position. When the stack section 2 and tube 5 are telescoped, the guy wires are not necessary. In this case, the guy wires simply collapse, it being understood, that when the stack is again extended, the wires are drawn taut.

'lhe extensible stack section 2 is elevated by a plurality of jackscrews 15 which are equi-distantly located in circumferential relationship in the space 4. Each of the jackscrews 15 has a bevel pinion 16 on the bottom with which another bevel pinion 17 meshes. The bevel pinions 17 form the driving elements for the jackserews l5, being in turn rotated through counter-shaftl and gear connections 18 and 19 driven from a motor 20. It will be evident that each of the jackscrews 15 is individually driven. Each jackscrew is rotated at a uniform rate of speed, and it therefore follows that the lifting power is applied to the extensible stack section 2 uniformly and at equi-distantly located places.

Screw blocks 21 are fixed at proper intervals in the space 12 at the bottom of the extensible stack section 2 and the tube 5. The lacksc'rews l5 are threaded into these blocks and project above .the blocks a short distance as at 21a, when the stack sectionV 2 occupies the limit of its extension. The pro- ]ectingend 21 of each` jackscrew1, enters the lower end Vof a pipe 22 which acts as a guide for the j ackscrew when the sta-ek sectionV 2 is being lowered. rlhere are four of these pipes, one for each jacksc'rew. The pipes 22 are supported at the top by a suitably arranged bracket 23.

The indicator illustrated in Fig. 6, is provided so that the operator may tell how high the extensible stack section 2 is projected outof the stationary section 1. The indicator comprises a movable pointer 2st which is threaded on one 0f the jackscrews 15 near the motor 20. The pointer 24 is held from turning, by engaging a guide 25 which has a calibrated dial 26 over which the pointer plays. As the jackscrew 15 is rotated, the pointer 24 moves up and down and indicates the distance to which the extensible stack section 2 stands projected, according to the direction of rota-tion of the jackshaft. Obviously, an automatic cut-off mechanism may be embodied in the indicator. This, however, is a. feature which it is not sought to embody in the present subject matter, althoughit may be stat-ed that an arrangement of an electric circuit closer for breaking the motor circuit may readily be embodied to stop the motor when the pointer reaches either extremity of its movement.

The form of thetele's'copic stack illustrated in Fig. 4, is substantially the same as that illustrated in Figjl. The exception is, that the tube 5 on the extensible stack section 2, is omitted. This makes a lighter stack. In this construction, it is necessary to provide the removable umbrella or hood 27 which is madein halves so that it can be removed. l.Vlie-n the stack section 2 is extended, the hood 27 is placed and clamped in position,

as shown in Fig. e. Before the stack section 2 can be lowered, the hood 27 must be removed, whereupon the stack section 2 maj,Y

be lowered to the-desired position. The

hood 27 is then again clamped over the enships on the ocean been desirable.

Y motor 20.

trance to the space al between the section l and the tube 3, to prevent the entrance ot foreign elements to the space.

The operation of the device will be. readily understood from the following when taken in connection with the foregoing description. The telescopic stack is intended primarily for use on ocean vessels. lleretofore, a telescopic smoke stack has not been necessary. The reason for the absence of thisv necessity is due to the fact that not until the presenttime has the low visibility o't' This condition has been brought about by the danger to ships passing' through the war zone ,where danger of attack is ever iinminent. From this it will bc understood, that the purpose of the whole invention is to decrease the visibility of the ship and render the passage more safe, this decrease in the visibility of the ship being` directl \v accomplished by the use of the telescopic smoke stack hereinbcfore described. Obviously, the ability to lower the smoke stach from its normal extended height to its telescoped position, representing a difference o t approximately twenty feet, materially decreases the visibility of the vessel. if it he found advisable to telescope the smoke stack` kthe jackscrews 15 are operated simultaneously and at the same rate of speed by the The stack section 2 then telescopes into the stationary sta-ck section l. The tube 5 surrounding the section 2, also telescopes into the stationary tube 3. )is the stack section 2 moves downwardly, the npper ends of the jaekscrews 15 become freer and would tend to vibra-te were it not for the provision of the pipes 22 which receive the jackscrews 15 and act as guides therefor.

rllhe use of either of the forms of the invention illustrated in Figs. 1 and l is optional. s stated above, the stack structure shown in Fig. i is lighter because of the absence of the tube 5 surrounding the cX- tensible stack section 2. In this form, however, the hood 27 must be taken oli' and replaced each time the stack is adjusted. ln the preferred form of the invention shown in Fig. l, this is not necessary. The hood 11 moves with the extensible section 2 and the tube 5 and section 2 move together. lt should be explained that in the form illustrated in Fig. al, the upper ends of the jackscrews 15 are supported in bearings 15. These lare the equivalents of the pipe guides 22 in Fig. l. As incidental features of construction, all of the joints of the plates used in the stack sections are butt joints. By the use of flush riveting on the sliding surfaces of the sections, very little clearance need be allowed between the stationary and extenw sible stack sections.

Itis desired to emphasize the simultaneous lll) nasser? and uniform operation` of each of the acirscrews, whereby a uniform andsimultaneous lifting power is exerted on the extensible stack sections and at equi-distantly located points. This obviously prevents binding and insures the rapid extension of the stack sec tions.

While the construction and arrangement of the device as illustrated in the accoinpanying drawings, is that of a generally preferred form, obviously modications and changes may be made without departing from the spirit of the invention or the scope of the claims.

l claim:

l. A telescopic stack comprising a double walled stationary stack section, a double walled extensible stack section slidable be tween the walls of the stationary stack section, and means for raising and lowering said extensible section, located between said walls out of contact with the stach gases.

Q. A telescopic stack comprising a stationary staclr section, an extensible staclr section slidable thoreover, means for raising and lowering said extensible section, located exteriorly of the sections out of contact with the stack gases, and means inclosing said raising and lowering means, to protect the latter from the elements.

3. A telescopic staclr comprising a stationary stack section, an inclosing tube con centric with and spaced from said stack section, an extensible stack section slidable over| the stationary section, an inclosing tube concentric with and spaced from the extensible stack section, and slidable inside of said stationary tube, and means for raising and lowering the extensible stack section and tube, located in the space between said sections and tubes.

a. A. telescopic stack comprising a double walled stationary stack section, a double walled extensible stack section slidable between the walls of the stationary stack sec tion, a plurality of jack screws located between the stationary walls of the stationary stack section, screw blocks receiving said jaclscrews and carried by the extensible stack section, and means carried by said extensible stack section for receiving the ends of the j ackscrews and acting as guides there for1 upon telescoping the stack.

5. A telescopic stack comprising a sta* tionary stack section, an extensible stack section slidable thereover, screw bloclrs carried by the extensible stack section, jaclo screws adjacent to the stationary stack sec tion and received by the screw blocks, and motor and gear devices for rotating the jackscrews simultaneously and at the saine rate of speed, to apply the power for lifting the extensible section uniformly.

6. ln a stack, the combination of a stationary stach section, an extensible stack section slidable thereon, means located externally of the stack sections for elevating the-extensible stack section and located out of contact of the stack gases, means for housing'said elevating means to shield it from the weather, and means for guiding said elevating means.

7. ln a stack, the combination of a stationary stack section, an extensible stack sec- `tion slidable thereon, a screw block carried by the extensible stack section, a jaclrscrew located exteriorly of the stationary stack section and threaded in the screw block, the upper end thereof projecting beyond the screw block, and a pipe receiving the projecting end of the jackscrew to prevent vi bration thereof on telescoping the extensible staclr section.

8. lin a stack, the combination with the decir of a vessel having an opening and a flange surrounding the opening, of a double walled stationary stack section projecting through said opening, an umbrella carried by the outer wall and covering said opening, a double j walled extensible staclr section slidable between the walls of the stationary stack. section, section extending means located between the respective walls, and a hood mounted on one of the walls of the exi tensi-ble section and covering tween the walls at the top ments from said means.

9. ln a staclr, the combination of stationary and extensible stack sections, means for raising and lowering the extensible sections including a jaclrscrew, a pointer, screw threaded on the jaclrscrew and movable up and down thereon according to the rotation of the jaclrscrew, and a guide for the pointer preventing it from rotating, said guide having calibrations for indicating the height of the extensible stack sections.

l0.. lin a stack, a double walled stationary section, an extensible stack section slidable in the space between said walls, motor driven extending means situated at the base of the stationary section, and a plurality of jackscrews driven by said means and extending into engagement with the extensible section, said jacltscrews being located equidistantly apart in the space between the walls of the stationary section, to apply the lifting power uniformly and prevent binding between the stack sections.

l1. ln a stack, a double walled stationary stack section, an extensible section slidable in the space between said walls, a plurality of jaclrscrews located in said space in driving engagement with the extensible section, and rotating means for the jaclrscrews located at the base of the stationary stack section, said means including motor driven countershaft and gear' devices.

the space beto exclude the ele- In a steek, e stationary double walled by the extensible section arranged t0 cover sectlon, enextensble section sldable in the the space between the Walls of the stntion- 10 space between said Walls, elevating jackary section.

Screws occn yin said suaee at e ndstantlj y T located stllljatos, elezttng ssi-ew blokb hob RAD LANGER' carried by the extensible section nd reee'v- Ttnesses:

ing the jackscrews, 'bearing' n'lealns for the H. G. CROSBY,

ends of said jackscrews, and n hbod carried C. LAURENCE KASPAR.

Copies of'thi's patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

